While I realize there are very few people shooting a Leica, particularly a very old Leica such as a screw mount series, this is a fun project to repurpose a (censored) camera with a decent lens to a camera that I think is one of the best ever made.
Step 1: Prep
Step 2: Sanding
You will need to test the focus of the lens to make sure it's sharp. my way of doing this was to take another M39 camera I had (an old FED 3b) and locking up the shutter and holding a piece of sanded glass to the back continuously test focus after sanding. Don't over sand!
Step 3: The Mount
If you have an M mount camera you can use an m39-m adapter to use it on post screw mount leicas. (or on a Bessa or Ikon)